Crushing and screening apparatus



lllil- LGILOZS @ecq l4 1926.

C. A. GUSTAFSON GRUSHING AND SCREENING APPARATUS l 4 Sheets-Sheet 1 J 5M n 0 n 4 Fil July 9, 1924 C. A. GUSTAFSON GRUSHING AND SCREENINGAPPARATUS I Dec. 14 1926.

4 Sheets-Shefi. 2

Filed lJu Dec. 14 W26. mmw c. A.'GUSTAFSON CRUSHING AND SCREENINGAPPARATUS N Filed July 9, 1924 4 Shee tsSheet 5 mamas Q. A. causTA FsomCRUSHING AND SCREENING APPARATUS Filed' July 9 4 Sheets-Sheet 4 roads ithas been found desirable that the to s Patented Dec. '14, 1926s U ITED SATES PATENTUOFFICE.

CARLA; euszrarson, or mmunaroms, MINNESOTA, ASSIGN-OR 'ro RUssnLLGIiAnERMANUFACTURING COMPANY, MINNEAPOLIS, MINNESOTA, A CORPGRATION 0FMINNESOTA.

v cnusrrr'ns annscnnnnme APPARATUS.

7 Application filed my, 1924. Serial- No. mess.

or which may readily be moved from place to place. I

Inthe building of public highways and rough material such as gravel,used in the construction thereof; be of a substantially uniform size inorder that-best results may be obtained. 'It is thereforedesirable thatmeans he provided whereby the ravel, as it is taken from the pit,-- maypassed through a sizing device wherein thecoarser material-such asstones, will be crushed to a certain degree of fineness before beinischarged into the hopper or other sulta le receiv'ingmeans forsubsequent, use in t e construction of the road; i

It is therefore the object of this invention to provide an improvedscreening and crushing apparatus adapted for use to prepare to asubstantially uniform size, the usual rough material used in "theconstruction of roads and the like."

A further and more specific object of the invention is to provide suchanapparatus which is self-contained and is portable so that it may readilymoved about from place to place.

Other objects of the inventionjwill more fully appear from the followingdescrip "tion' and theaccom anyingidrawings and will be pointed out.mthe annexed claims.

In'thei-drawings there has been disclosed a structure designed tocarryoutgvthe various objects of the invention; but it is to be understoodthat the invention is not confined to the exact features shown asvarious the claims which follow. a a p In the accompanying drawingsforming a part of this specification,'

Figure 1 is a longitudinal sectional elevat onon' line 1-1 of Figure 2of my improved screenin and crushing apparatus, .showing' how t ecoarser material is discharged -from the shaking screens into a crusherto be brokenfup; F

' changes may be'made within the scope of ssts of opposed side beams.

Figure 2 is a cross-sectional View on the line2-2of Figure 1 showing howthe material is received from the crusher and discharged into abucketconveyor to, be returned to the shaking screens or grizzly'for finaldischarging into the receiving hopper; rFigure 3 is a similarcross-sectional View on the line 33 of Figure 1 showing how ifiedconstruction.

the re The novel screening and crushing plantfeatures in thisinvention-and shown in the accompanylng. drawings comprises a hop-- per6 rigidly mounted in the frame of the structure. The mainframe referablycongether at their ends by means of cross-memwheels 12 and 13. Thehopper 6 is arranged between and is secured to the side beams 7, (Figure3). j

1 An oscillating screen or grizzly is mounted above the hopper 6. V Thisgrizzly preferably comprises a frame '14 suspended from connected to-.theicrushed material is discharged onto the lower coarser screen of thegrizzly;

cross-bars 15 by means of links 16 as particularly shown in Figures 1and 3. The

form of grizzly here shown preferably comprises an upper screen 17 ofcomparatively fine mesh and a lowersscreen 18 of a relatively coarsermesh; :A cross shaft 19* ism'ounted in the frame of the structurebeneath the discharge endof the grizzly f and thisshaft has mountedthereon a pair of eccentrics 21, on which'are arranged the pitmen 22,having'their-o' flposite ends piviotally connected the lame 14 of thegrizzly. Thus, whenjthe shaft 19 is rotated an oscillating or,shakingmovement will be imparted to the grizzly therebycausing the hopperfiiandgthecoarser material to be discharged therefrom "into a suitablecrusher tionand comprises a frame23 in which is mounted the stationaryjaw 2 v adapted to as a oe", 0 finer material tojpass therethrough intothe l its cooperate with. the movable jaw 25 to crush the coarsermaterial as it is discharged thereinto. The movable jaw 25 is operatedby means of an eccentric 26 mounted upon the shaft 27 of the crusher; Asuitable fiy wheel or pulley 28 is mounted on the shaft 27 adapted toreceive a belt 29 by means of which the entire apparatus may be drivenfrom a suitable source of power.

The jaws 24 and 25 extend crosswise of the frame, the'stationary jawbeing next to the hopper and below the discharge end of the screens(Figure 1). A plate 25 is arranged above the stationary jaw andserves todirect material passing over the screens into the space between the jawsof the crusher.

The material such as gravel, may be delivered to the'grizzly by anysuitable means, as by the conveyor belt 31 operated by a roller 32 upona suitable conve or frame, 33. This conveyor is preferably ofconsiderablc length so as to extend into the pit from which the materialis being removed and delivered to the grizzly. I claim no invention inthe construction of this conveyor and I have therefore shown only aportion thereof.

A hood 34, having a cover 35 substantially closing the rear end thereof,is mounted at the discharge end of the grizzly andover the jaws of thecrusher. This hood functions to prevent particles of the material suchas pieces of stone from flying out of the crusher while the machine isin operation, which might cause injury toworkmen laboring about theapparatus. An operators platform 36 is also mounted ad acent thedischarge end of the grizzly and a portion of this platform forms theupper wall of the hood 34, as shown in Figures 1 and 2. A perforatedplate 37 is mounted in that po tion of the platform comprising the-upperwall of the hood 34, and the perforations in this plate are of such sizethat the operator may watch the action of the crusher during theoperation of the machine.

As the coarser material, discharged into the crusher from the upperscreen 17 of the grizzly, is crushed by passing between the jaws 24 and25 of the crusher, it is discharged into an oscillating, inclined spoutor trough 38. This trough conveys the crushed material into the lower orreceiving end of a bucket conveyor 39 mounted adjacent one side of themachine, as particularly shown in Figure 2. This conveyor is preferablymounted at an incline and the upperend thereof extends to a point abovethe hopper 6. An inclined receiving spout 41 is mounted at the upper endof the bucket conveyor in position to, receive the material as'it is discharged therefrom, and to convey it back to the grizzly. The frame 42 ofthe bucket conveyor and also the spout 41 are preferably supportedbymeans of a structural frame comprising the upright posts 43 and 44 andthe horizontal cross-members 45 and 46 onto the upper screen which aresuitably riveted together and mounted upon and secured to the side-beam7 of the main frame. The upper end of the bucket conveyor is supportedupon a sprocket wheel 47 carried by a shaft 48 upon one end of which asprocket wheel 49 is mounted. A

As shown in Figure 2, the oscillatingtrough 38 mounted beneath thecrusher, is preferably supported upon oscillating links 55, each havingone end pivotally mounted on the main frame of the apparatus. Thistrough is actuated by means of a pitman 56 having one end pivotallyconnected thereto and its other end mounted upon an eccentric 57 securedto a shaft 58 which is mounted in I preferably in parallel relation tothe side eams 7, 7, of the main frame of the apparatus. The shaft 58 isrotated b means of a bevel gear drive 61 which is riven from the crushershaft 27 by means of a suitable chain belt 62, shown in dotted lines inFigure 1.

Referring to the drawings,

suitable bearings 59,]

especially Figures 3 and 4, it will be noted that the coarser materialafter having passed through the crusher is returned to the grizzly bymeans of the bucket conveyor, but is not discharged 17, but through anopening 63 provided therein and directly into the lower coarser screen18. The crushed material will then pass through the screen 18 and intothe hopper 6, but should some of the material still be too coarse topass through the lower screen it will again be conveyed to the crusherfor subsequent crushing or breaking up until it reaches a degree offineness which will permit it to pass through the lower screen into thehopper 6. Thus, all of the material delivered into the grizzly from theconveyor 31 must pass through the screens but it is discharged into themain hopper 6.

Means are also provided for conveying the material from the hopper 6 anddelivering it to a suitable receivin means such as a truck, wagon orbin. Sucih means preferably consists in the provision of a deliveryconveyor pivotally mounted upon brackets 64 secured to the main frame ofthe structure and having its receiving end extending beneath the hopper6 and its other end outwardly extendin therefrom as shown in Figure 3.The rame 65 of this conveyor is adjustably supported adjacent its outerend by means of cables or chains 66, each having one end secured to thef'upright posts 43 ofthe frame and passing around sheaves 67 and backand around a shaft 68 so that when the shaft 68 is rotated, the outerend of the conv yor may be raised or ldwered, as desired. The shaft 68is manually operable by means of a hand wheel 69 and 1s locked inposition by means of a ratchet device 70, of ordinary construction, asshown in Figure 2. The sheaves 67 are connected to the conveyor frame bymeans of rods 71. Rollers 7 2 and 7 3 are mounted adjacent each end ofthe conveyor frame and a conveyor belt 74 is mounted on these rollersand is supported therebetween by means of a series of spools 75 androllers 76, rotatably mounted on the frame 65. The lower reduced portion77 of the hopper 6 is open and is preferably inclined to substantiallyconform to the angle of the belt as shown in Figure 3. Thus it will benoted that the belt 74 forms the bottom of the hopper 6 and when thisbelt is inoperative the hopper may be filled without danger of thematerial 1 running out of the bottom of the hopper and onto the ground.This is eflected by means of the surface. of the belt resting on theconcaved spools 75, as shown in Figure 2. A gear wheel 78 is mounted onthe shaft of the upper roller 73 of the conveyor and this gear mesheswith a pinion 79 secured to a counter-shaft 81 which is mounted insuitable bearings secured to the frame of the conveyor. A pulley 82 isalso secured to this shaft and a belt 83 is mounted on this pulley andpasses around a clutch pulley 84 mounted on the driven shaft '58.Thispulley is provided with a suitable clutch85 of ordinary constructionindicated by dotted lines in Figure 1. This'clutch is operable by meansof a vertical shaft 86 which has a lever 87 mounted upon the upper endthereof within convenient reach of an operator standing upon theplatform 36, shown in full lines in Figure 2 and dotted lines inFigure- 1. An auxiliary lever 88 is secured to the lower end of t eshaft 86 so that the clutch 85' may also be actuated by an operatorstanding upon the ground, if so desired. Thus it will be seen that theoperation of the delivery conveyor belt 74 may be controlled by means ofthe clutch 85 actuated-by either of the levers 87 or 88,

Means are also rovided for controlling the; operation of t e feedingconveyor 31,

- during the operation of the apparatus. Similarly, to the deliveryconveyor this conveyor is also provided with a gear wheel 89 meshingwith apinion 91 mounted on a shaft 92. A clutch pulley 93 is mounted onone end of this shaft and is driven by means of a belt 94 froma pulley95 mounted on the cross-shaft 19 as shown in Figure 2.

The pulley 93 is also provided with a clutch 96, (Figures 2 and 3), ofordinary construction, which is actuated by means of a hand lever 97arranged adjacent the hand-wheel 69 and lever 87, and also by means of adepending lever 98 whereby it also maybe actuated by an operatorstanding on the ground. Thus, the operation of the feeding and deliveryconveyors may be controlled independently of each other andalsoindependently ofthe operation of the rest of the apparatus. A beam99 is preferably mounted upon the horizontal angle bars 45 and 46 of theupper portion of the main frame in order to provide means for raisingand lowering the feed conveyor 31, as when moving from place to place.Whenit is desired to move thisnovel screening and crushing apparatus, itis necessary to disconnect'the feed conveyor therefrom. This maytherefore be conveniently accomplished by securing an ordinary block andtackle (not shown) to the upper end of the conveyor and to the loop 101provided .at the end of the beam 99, it being understood of course, thatthe conveyor is detachably connected to the main frame.

Operation.

elevated thereon andpdischarged into the grizzly through which all thesmaller material is directly passed into themain hopper 6. The coarseror over-sized material which cannot pass through the upper screen 17will be conveyed thereon to the crusher at the rear end of the machine.As it is passedthrough the crusher it will be crushed or broken anddischarged therefrom into the inclined oscillating trough 38 'fromwhenceit will be discharged into the bucket conveyor 39 and elevated to thespout 41 and returned to the grizzly. The crushed material thusdischarged into the grizzly'will pass through the opening 63 providedinthe upper screen and will 'be thus discharged directly onto the lowercoarser screen 18 through which it will pass into the hopper 6. Shouldan of the material after having passed through the crusher, still be toolarge to pass through the screen 18 it will again be returned to thecrusher from whence it will be brought again onto the lower screen 18and this operation repeated until all the material has'been reduced tosuch size that it will pass therethr'ough into the hopper. It willtherefore be seen that all of the material ,must pass through thescreens of the grizzly before entering thehopper 6 and will therefore besubstantially of auniform 's'ize.- The hopper 6 is preferably of suchrial to filla truck or wagon so that when such a device is positionedbeneath the dis charge end of the delivery conveyor belt 74 and theconveyor is started, by the manipulation of either of the hand levers 87or 88, the material may be delivered into the truck or wagon in acomparatively short period of time. As soon as the truck or wagon hasbeen loaded the operation of the conveyor will be interrupted by meansof the clutch 85 and the hopper 6 will then again begin to fill until itis again desired to empty it. Thus the operation of the deliveryconveyor belt 74 may readily and conveniently be controlled to empty orconvey the material from the hopper to a suitable receiving means duringthe operation of the entire apparatus.

In the drawing, I have shown the grizzly as comprising an upper and alower screen but it is to be understood that a single screen or aplurality of screens, may be employed if desired and still be within thescope of the invention.

[In Figure 5 there is shown a modified construction wherein means areprovided to prevent too much of the finer material, such as sand, fromgetting into the hopper. In certain localities or townships the roughmaterial used in the construction of roads and highways must meet withcertain specifications. Such specifications often re quire that thematerial must contain only a certain percentage of sand and it is therefore desirable that means be provided whereby a portionof the sand maybe prevented from entering the hopper. As shown in this figure, thereceiving end of the grizzly comprises two screens, the lower screen 102being of a comparatively fine mesh and the upper screen 103 of arelatively coarser mesh. Both screens are comparatively short extendingonly to a point beyond the spout 41 of the bucket conveyor '39. A spout104 is mounted beneath the lower screen'102 and this spout'extendspartway into the hopper 6, an opening 105 being provided in the wall ofthe hopper to provide clearance for the spout. The upper screen 103extends beyond the end of the finer screen 102 so that a gap 106 isprovided between the finer screen 102 and the end of the lower mainscreen 107 which is prefs erably of the same mesh as the upper screen103. The screen 107 extends from the screen 103 to the discharge end ofthe grizzly. In the operation of this device, the material is dischargedfrom the feed conveyor 31 to the upper screen 103 and the finer materialsuch as the sand and other material which can pass through the screen103 Wlll pass therethrough into the finer screen 102. The sand will thenpass through the screen 102 and drop into the spout 104- from whence itwill be discharged onto the ground or a suitable receiving means (notshown) at one end of the machine. The material that is too coarse topassthrough the screen 102 will drop through the gap 106 and into the hopper6. Also thematerial' that is too coarse to pass through the upper screen103 will be discharged therefrom onto the lower main screen 107, which,as before stated, is preferably of the same mesh, and will be conveyedalong on this screen to the dis charge end of the grizzly and into thecrusher wherein it will be crushed and returned to the upper screen 103in the manner similar to that'described with reference to the priorfigures.

The details of the construction may be varied in many particularswithout departing from myinvention.

I claim as my invention:

1; An apparatus of the class described, comprising, in combination, aframe, a hopper mounted therein, a screening means arranged above saidhopper and having a fine and coarse mesh, and means for delivering thematerial initially to the fine mesh, a crusher mounted at one end ofsaid screening means adapted to receive a portion of the materialdischarged into said screening means, and means for returning thematerial passing through'said crusher to the coarse mesh portion of saidscreenin means.

2. In the apparatus of the c as described,

the combination. of a hopper, a plurality of oscillating screens ofdiiferent meshes arranged above said hopper in superposed spacedrelation with the finer screen above and the coarser screen below, meansfor feeding material initially onto the finerscreen. a crusher at oneend of the screens adapted to receive andcrush the over-sized materialnot passing --therethrough, and means for returning to the coarserscreen the material passing through said crusher.

3. In a apparatus of the class described, the combination of a hopper, agrizzly mounted for oscillatory movement over said hopper, said grizzlycomprising an upper screenof comparative y fine mesh and a lower screenof relatively coarser mesh, means for feeding material'onto said upperscreen, the finer .material passing throu h said screens and into saidhopper, a crus er arranged at one end of said grizzly adapted to receiveand crush the oves sized material and means for returning to the lowercoarser screen of said grizzly the material passing through saidcrusher.

4. In an apparatus of the class described, the combination of a frame, ahopper mounted therein, an oscillating grizzly having screening surfacesof varying mesh, means for feeding material into said grizzly, a crushermounted to receive and comprising, in combination,

tain mesh of said grizzly the crushed material from said crusher so thata portion of it may pass through said grizzly and into said hopper.

5. An apparatus of the class described, comprising, in combination, aportable frame, a hopper mounted therein, a fine and coarsescreeningmeans above said hopper, having a fine screen for removal ofsand, and a chute extending from below said fine screen and arranged todischarge fine material outside of said hopper, and a crusher arrangedat the opposite end of said screen, adapted to receive the material thatpasses over the tail of said screening means, the middle portion of saidscreening means discharging material into said hopper.

6. An apparatus of the class described, comprising in combination aframe, a hopper mounted therein, a screening means located above saidhopper, and having a head section of fine mesh arranged to deliver thefine material passing through said head section outside of said hopper,acrusher munted to receive the tailing material that passes over saidscreening means, the material that passes through said screening meansintermediate the head and tail thereof being discharged into saidhopper.

7. An apparatus of the class described, a portable frame, a hoppermounted therein, an oscillating screening means arranged above saidhopper and provided with. screening surfaces of difierent mesh, acrusher arranged at one end of said screening means adapted to receiveand crush the material that passes over said screening means, means forreturning to a screening means surface of certain mesh the materialpassing through said crusher, and means located in proximity to saidcrusher for controlling the different instrumentalities of the machine.I I

8. In an apparatus of the class described,

the combination, with a portable frame, of a hopper mounted therein, ascreening means arranged above said hopper, a crusher arranged at thetail end of said screening means and adapted'to receive material thatpasses over said screening means, a guard arranged over said crusher andadapted to deliver the material passing from said screening means intosaid crusher, said guard being provided with a perforated doorpermitting examination of the material passing from said screening meansto said crusher.

9. An apparatus of the class described comprising a frame, a hoppermounted therein, a screening means mounted for oscillation above saidhopper and comprising fine and coarse screening surfaces, and means forinitally delivering the material to the surface with fine mesh, acrusher arranged to receive the tailings from said screening means orthe coarse material too large to pass therethrough, and means forreceiving the crushed material from said crusher and returning it to acoarser mesh surface of said screening means. a i

10. An apparatus of the class described comprising a frame, hoppermounted there-,

in, an oscillating screen arranged over said hopper and Whereto a bodyof the coarse material is delivered, said screenhaving a comparativelyfine and coarse mesh, the fine mesh section of said screen being adaptedto deliver fine material passing therethrough outside of said hopper, acrushing means arranged to receive the coarse tailings from said screenwhich are too large to pass through the meshes thereof, and meansarranged to receive such crushed material and elevate'it for delivery tosaid screen for re-separation.

In Witness whereof, I have hereunto set my hand to this th day of June,1924.

CARL A. GUSTAFSON.

